The ventral surface of the adult heart as seen on gross examination or radiography is comprised primarily of the

E. During embryological formation of the heart, the arterial and venous ends of the heart tube are fixed in place. As further growth continues, the heart tube folds to the right. This greatly contributes to the ventral surface of the adult heart being comprised primarily of the right ventricle. The definitive anatomical orientation of the adult heart within the thorax is not at all similar to the strong image we have in our minds of the classic Valentine’s Day heart.